Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Threading problems, not working

Posted on 2004-08-01
2
Medium Priority
?
215 Views
Last Modified: 2010-04-15
HI,

I need to read a large file, and find certain words in the file, then list them in a listview.

I can do it, but the problem is that it has to read the whole file before it updates the listview. I need to to update the listview as it reads the file, ie. one addition at a time, while it is also continues to read the file. I added the basic functions that I am using, not the full code, but you should be able to see what I am doing for the code below.

t = new Thread(new ThreadStart(Add_Words));
t.Start();

//Words is a property that gets the search words

//This is in a function that reads the file
while((str = reader.ReadLine()) != null)
{
link=str;
if (str.IndexOf(search_word) > 0)
{
this.Words = s;
//I truncate the string to get only the word
Add_Words();
}
}

private void Add_Words()
{
item = new ListViewItem(this.Words);
lst_words.Items.Add(item);
}
0
Comment
Question by:unomateo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 10

Accepted Solution

by:
smegghead earned 500 total points
ID: 11687593
You have to invoke the call to Add_Words..

All calls to the GUI must be done on the main thread.

So..

Create a delegate for a method with no parameters

      private delegate void CallUpdate();

then, rather than calling Add_Words();  

do the following

      this.Invoke(new CallUpdate(Add_Words));

Smg.
0
 
LVL 10

Expert Comment

by:smegghead
ID: 11687594
Also, you might want to do a 'Refresh' on the control after adding each entry.
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In order to hide the "ugly" records selectors (triangles) in the rowheaders, here are some suggestions. Microsoft doesn't have a direct method/property to do it. You can only hide the rowheader column. First solution, the easy way The first sol…
Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…

609 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question